/Engine/Source/Editor/UnrealEd/Public/EditorAnimUtils.h
Duplicates the assets stored for retargetting, populating maps of original assets to new asset
void DuplicateAssetsToRetarget ( [UPackage](API\Runtime\CoreUObject\UObject\UPackage) * DestinationPackage, const [FNameDuplicationRule](API\Editor\UnrealEd\FNameDuplicationRule) * NameRule )